5166 search results - page 251 / 1034 » Web Query Optimizer |
149
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ICDT
1995
ACM
15 years 10 months ago
1995
ACM
A tuple t1 of relation R subsumes tuple t2 of R, with respect to a query Q if for every database, tuple t1 derives all, and possibly more, answers to query Q than derived by tuple ...
160
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VLDB
1987
ACM
15 years 10 months ago
1987
ACM
Severalmethodshavebeenproposedto compile recursive Datalog programs. The most well-known perform a rewriting of rules using MAGIC or PROBLEM predicates in order to push selections...
151
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PVLDB
2010
15 years 4 months ago
2010
In XML search systems twig queries specify predicates on node values and on the structural relationships between nodes, and a key operation is to join individual query node matche...
201
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APPT
2003
Springer
15 years 11 months ago
2003
Springer
The increase number of mobile users in wireless environment affects query access time substantially. To minimise the query access time, one possible way is to employ data broadcast...
285
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ICDE
2003
IEEE
16 years 7 months ago
2003
IEEE
There has been interest recently in skyline queries, also called Pareto queries, on relational databases. Relational query languages do not support search for "best" tupl...